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The Tillitis Key is a new kind of USB security key inspired by measured boot and
DICE.

Tillitis Key’s design encourages developers to experiment with new security key
applications and models in a way that makes adoption easier and less risky for
end-users.

It offers both security and flexibility by being end-user programmable while
also preventing applications loaded onto the device from knowing each other’s
secrets. During use firmware on Tillitis Key derives a unique key for each
application it runs by measuring it before execution. This is done by combining
an application’s hash value with a unique per device secret. Applications are
loaded onto the device from the host computer during use, and are not stored
persistently on the device.

A user- or host-supplied secret can also be mixed into the key derivation
function, providing further protection. A sophisticated physical attacker should
be assumed to have knowledge of the target application’s hash, and will likely
eventually succeed in extracting the UDS from the hardware. By adding a
host-supplied secret, knowledge of the application used as well as the security
key’s UDS is not sufficient to produce the application secret. This makes the
security impact of a lost or stolen Tillitis Key less than for conventional
security keys.

Device applications can be chain-loaded where the first application stage hands
off its secret to the second stage. This improves user experience as it makes it
possible for the application secret (and its public key) to remain the same even
if a device application is updated. It also enables developers to define their
own software update trust policies. A simple first-stage application might do
code signing verification of the second stage, whereas a more advanced one will
require m-of-n code signatures, or a Sigsum inclusion proof. Sigsum was designed
with embedded use cases in mind.




OPEN SOURCE HARDWARE AND SOFTWARE

Tillitis Key is and always will be open source hardware and software.
Schematics, PCB design and FPGA design source as well as all software source
code can be found on GitHub.

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